print('hellowolrd')

a=1
b=2
c = a + b
print(c)

## 算术运算符
c = 19 / 4
print(c) # 4
c = 19 % 4
print(c) # 3

c = 4*2
print(c) # 8
c = 4 ** 2
print(c) # 16

c = 1
c += 4
c = c + 4
print(c) # 5

c = 2
c *= 3 # c = c * 3
print(c) # 6

## 关系运算符: < , > , ==
# 布尔类型
a = False
b = True
c = True

x = 4
y = 8
print(x < y) # True
print(x > y) # False

a = 10
b = 10
print(a == b) # True
print(a != b) # True

if a == b:
    print(' a 等于 b')
else:
    print(' a 不等于 b')



## 表达式： 通过运算符把变量连接起来，形成一个式子，这个式子就叫表达式
## 一个表达式是有值的
# print(c=2)



